Clutter interference management

ABSTRACT

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a base station may determine, for full-duplex mode communication on a first link and a second link, a timing adjustment to at least one of a first timing or a second timing, wherein the timing adjustment is to cause a delay between clutter reflection from a first signal and an occurrence of a second signal to occur during a cyclic prefix of the second signal; cause the timing adjustment to be applied to the at least one of the first timing or the second timing; and communicate in the full-duplex mode with a first node and a second node in accordance with the timing adjustment, wherein communicating includes transmitting the first signal to the first node and receiving the second signal from the second node. Numerous other aspects are provided.

CROSS-REFERENCE TO RELATED APPLICATION

This Patent application claims priority to U.S. Provisional PatentApplication No. 62/968,652, filed on Jan. 31, 2020, entitled “CLUTTERINTERFERENCE MANAGEMENT,” and assigned to the assignee hereof. Thedisclosure of the prior Application is considered part of and isincorporated by reference into this Patent Application.

FIELD OF THE DISCLOSURE

Aspects of the present disclosure generally relate to wirelesscommunication and to techniques and apparatuses for clutter interferencemanagement.

BACKGROUND

Wireless communication systems are widely deployed to provide varioustelecommunication services such as telephony, video, data, messaging,and broadcasts. Typical wireless communication systems may employmultiple-access technologies capable of supporting communication withmultiple users by sharing available system resources (e.g., bandwidth,transmit power, and/or the like). Examples of such multiple-accesstechnologies include code division multiple access (CDMA) systems, timedivision multiple access (TDMA) systems, frequency-division multipleaccess (FDMA) systems, orthogonal frequency-division multiple access(OFDMA) systems, single-carrier frequency-division multiple access(SC-FDMA) systems, time division synchronous code division multipleaccess (TD-SCDMA) systems, and Long Term Evolution (LTE).LTE/LTE-Advanced is a set of enhancements to the Universal MobileTelecommunications System (UMTS) mobile standard promulgated by theThird Generation Partnership Project (3GPP).

A wireless communication network may include a number of base stations(BSs) that can support communication for a number of user equipment(UEs). A user equipment (UE) may communicate with a base station (BS)via the downlink and uplink. The downlink (or forward link) refers tothe communication link from the BS to the UE, and the uplink (or reverselink) refers to the communication link from the UE to the BS. As will bedescribed in more detail herein, a BS may be referred to as a Node B, agNB, an access point (AP), a radio head, a transmit receive point (TRP),a New Radio (NR) BS, a 5G Node B, and/or the like.

The above multiple access technologies have been adopted in varioustelecommunication standards to provide a common protocol that enablesdifferent user equipment to communicate on a municipal, national,regional, and even global level. New Radio (NR), which may also bereferred to as 5G, is a set of enhancements to the LTE mobile standardpromulgated by the Third Generation Partnership Project (3GPP). NR isdesigned to better support mobile broadband Internet access by improvingspectral efficiency, lowering costs, improving services, making use ofnew spectrum, and better integrating with other open standards usingorthogonal frequency division multiplexing (OFDM) with a cyclic prefix(CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and/or SC-FDM (e.g.,also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) onthe uplink (UL), as well as supporting beamforming, multiple-inputmultiple-output (MIMO) antenna technology, and carrier aggregation.However, as the demand for mobile broadband access continues toincrease, there exists a need for further improvements in LTE and NRtechnologies. Preferably, these improvements should be applicable toother multiple access technologies and the telecommunication standardsthat employ these technologies.

SUMMARY

In some aspects, a method of wireless communication, performed by awireless communication device, may include determining, for full-duplexmode communication on a first link and a second link, a timingadjustment to at least one of a first timing or a second timing, whereinthe timing adjustment is to cause a delay between reception of a clutterreflection of a first signal and reception of a second signal to bewithin an adjusted cyclic prefix length of the second signal, whereinthe adjusted cyclic prefix length is based at least in part on a scalingfactor; causing the timing adjustment to be applied to the at least oneof the first timing or the second timing; and communicating in thefull-duplex mode with a first node and a second node in accordance withthe timing adjustment based at least in part on causing the timingadjustment to be applied, wherein communicating includes transmittingthe first signal to the first node and receiving the second signal fromthe second node.

In some aspects, a method of wireless communication, performed by awireless communication device, may include determining, for full-duplexmode communication with a first node and a second node, a first multipleaccess (MA) signature for the first node and a second MA signature forthe second node, wherein the first MA signature and the second MAsignature are selected to suppress residual clutter interference; andcommunicating in the full-duplex mode with the first node using thefirst MA and the second node using the second MA.

In some aspects, a wireless communication device for wirelesscommunication may include a memory and one or more processorsoperatively coupled to the memory. The memory and the one or moreprocessors may be configured to determine, for full-duplex modecommunication on a first link and a second link, a timing adjustment toat least one of a first timing or a second timing, wherein the timingadjustment is to cause a delay between reception of a clutter reflectionof a first signal and reception of a second signal to be within anadjusted cyclic prefix length of the second signal, wherein the adjustedcyclic prefix length is based at least in part on a scaling factor;cause the timing adjustment to be applied to the at least one of thefirst timing or the second timing; and communicate in the full-duplexmode with a first node and a second node in accordance with the timingadjustment based at least in part on causing the timing adjustment to beapplied, wherein communicating includes transmitting the first signal tothe first node and receiving the second signal from the second node.

In some aspects, a wireless communication device for wirelesscommunication may include a memory and one or more processorsoperatively coupled to the memory. The memory and the one or moreprocessors may be configured to determine, for full-duplex modecommunication with a first node and a second node, a first MA signaturefor the first node and a second MA signature for the second node,wherein the first MA signature and the second MA signature are selectedto suppress residual clutter interference; and communicate in thefull-duplex mode with the first node using the first MA signature andwith the second node using the second MA signature.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a wirelesscommunication device, may cause the one or more processors to determine,for full-duplex mode communication on a first link and a second link, atiming adjustment to at least one of a first timing or a second timing,wherein the timing adjustment is to cause a delay between reception of aclutter reflection of a first signal and reception of a second signal tobe within an adjusted cyclic prefix length of the second signal, whereinthe adjusted cyclic prefix length is based at least in part on a scalingfactor; cause the timing adjustment to be applied to the at least one ofthe first timing or the second timing; and communicate in thefull-duplex mode with a first node and a second node in accordance withthe timing adjustment based at least in part on causing the timingadjustment to be applied, wherein communicating includes transmittingthe first signal to the first node and receiving the second signal fromthe second node.

In some aspects, a non-transitory computer-readable medium may store oneor more instructions for wireless communication. The one or moreinstructions, when executed by one or more processors of a wirelesscommunication device, may cause the one or more processors to determine,for full-duplex mode communication with a first node and a second node,a first MA signature for the first node and a second MA signature forthe second node, wherein the first MA signature and the second MAsignature are selected to suppress residual clutter interference; andcommunicate in the full-duplex mode with the first node using the firstMA signature and with the second node using the second MA signature.

In some aspects, an apparatus for wireless communication may includemeans for determining, for full-duplex mode communication on a firstlink and a second link, a timing adjustment to at least one of a firsttiming or a second timing, wherein the timing adjustment is to cause adelay between reception of a clutter reflection of a first signal andreception of a second signal to be within an adjusted cyclic prefixlength of the second signal, wherein the adjusted cyclic prefix lengthis based at least in part on a scaling factor; means for causing thetiming adjustment to be applied to the at least one of the first timingor the second timing; and means for communicating in the full-duplexmode with a first node and a second node in accordance with the timingadjustment based at least in part on causing the timing adjustment to beapplied, wherein communicating includes transmitting the first signal tothe first node and receiving the second signal from the second node.

In some aspects, an apparatus for wireless communication may includemeans for determining, for full-duplex mode communication with a firstnode and a second node, a first MA signature for the first node and asecond MA signature for the second node, wherein the first MA signatureand the second MA signature are selected to suppress residual clutterinterference; and means for communicating in the full-duplex mode withthe first node using the first MA signature and with the second nodeusing the second MA signature.

Aspects generally include a method, apparatus, system, computer programproduct, non-transitory computer-readable medium, user equipment, basestation, wireless communication device, and/or processing system assubstantially described herein with reference to and as illustrated bythe drawings and specification.

The foregoing has outlined rather broadly the features and technicaladvantages of examples according to the disclosure in order that thedetailed description that follows may be better understood. Additionalfeatures and advantages will be described hereinafter. The conceptionand specific examples disclosed may be readily utilized as a basis formodifying or designing other structures for carrying out the samepurposes of the present disclosure. Such equivalent constructions do notdepart from the scope of the appended claims. Characteristics of theconcepts disclosed herein, both their organization and method ofoperation, together with associated advantages will be better understoodfrom the following description when considered in connection with theaccompanying figures. Each of the figures is provided for the purposesof illustration and description, and not as a definition of the limitsof the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

So that the above-recited features of the present disclosure can beunderstood in detail, a more particular description, briefly summarizedabove, may be had by reference to aspects, some of which are illustratedin the appended drawings. It is to be noted, however, that the appendeddrawings illustrate only certain typical aspects of this disclosure andare therefore not to be considered limiting of its scope, for thedescription may admit to other equally effective aspects. The samereference numbers in different drawings may identify the same or similarelements.

FIG. 1 is a diagram illustrating an example of a wireless communicationnetwork, in accordance with various aspects of the present disclosure.

FIG. 2 is a diagram illustrating an example of a base station incommunication with a UE in a wireless communication network, inaccordance with various aspects of the present disclosure.

FIGS. 3A-3D are diagrams illustrating an example of clutter interferencemitigation, in accordance with various aspects of the presentdisclosure.

FIG. 4 is a diagram illustrating an example process performed, forexample, by a wireless communication device, in accordance with variousaspects of the present disclosure.

FIG. 5 is a diagram illustrating an example process performed, forexample, by a wireless communication device, in accordance with variousaspects of the present disclosure.

DETAILED DESCRIPTION

Various aspects of the disclosure are described more fully hereinafterwith reference to the accompanying drawings. This disclosure may,however, be embodied in many different forms and should not be construedas limited to any specific structure or function presented throughoutthis disclosure. Rather, these aspects are provided so that thisdisclosure will be thorough and complete, and will fully convey thescope of the disclosure to those skilled in the art. Based on theteachings herein one skilled in the art should appreciate that the scopeof the disclosure is intended to cover any aspect of the disclosuredisclosed herein, whether implemented independently of or combined withany other aspect of the disclosure. For example, an apparatus may beimplemented or a method may be practiced using any number of the aspectsset forth herein. In addition, the scope of the disclosure is intendedto cover such an apparatus or method which is practiced using otherstructure, functionality, or structure and functionality in addition toor other than the various aspects of the disclosure set forth herein. Itshould be understood that any aspect of the disclosure disclosed hereinmay be embodied by one or more elements of a claim.

Several aspects of telecommunication systems will now be presented withreference to various apparatuses and techniques. These apparatuses andtechniques will be described in the following detailed description andillustrated in the accompanying drawings by various blocks, modules,components, circuits, steps, processes, algorithms, and/or the like(collectively referred to as “elements”). These elements may beimplemented using hardware, software, or combinations thereof. Whethersuch elements are implemented as hardware or software depends upon theparticular application and design constraints imposed on the overallsystem.

It should be noted that while aspects may be described herein usingterminology commonly associated with 3G and/or 4G wireless technologies,aspects of the present disclosure can be applied in othergeneration-based communication systems, such as 5G and later, includingNR technologies.

FIG. 1 is a diagram illustrating a wireless network 100 in which aspectsof the present disclosure may be practiced. The wireless network 100 maybe an LTE network or some other wireless network, such as a 5G or NRnetwork. The wireless network 100 may include a number of BSs 110 (shownas BS 110 a, BS 110 b, BS 110 c, and BS 110 d) and other networkentities. ABS is an entity that communicates with user equipment (UEs)and may also be referred to as a base station, a NR BS, a Node B, a gNB,a 5G node B (NB), an access point, a transmit receive point (TRP),and/or the like. Each BS may provide communication coverage for aparticular geographic area. In 3GPP, the term “cell” can refer to acoverage area of a BS and/or a BS subsystem serving this coverage area,depending on the context in which the term is used.

A BS may provide communication coverage for a macro cell, a pico cell, afemto cell, and/or another type of cell. A macro cell may cover arelatively large geographic area (e.g., several kilometers in radius)and may allow unrestricted access by UEs with service subscription. Apico cell may cover a relatively small geographic area and may allowunrestricted access by UEs with service subscription. A femto cell maycover a relatively small geographic area (e.g., a home) and may allowrestricted access by UEs having association with the femto cell (e.g.,UEs in a closed subscriber group (CSG)). ABS for a macro cell may bereferred to as a macro BS. ABS for a pico cell may be referred to as apico BS. A BS for a femto cell may be referred to as a femto BS or ahome BS. In the example shown in FIG. 1 , a BS 110 a may be a macro BSfor a macro cell 102 a, a BS 110 b may be a pico BS for a pico cell 102b, and a BS 110 c may be a femto BS for a femto cell 102 c. A BS maysupport one or multiple (e.g., three) cells. The terms “eNB”, “basestation”, “NR BS”, “gNB”, “TRP”, “AP”, “node B”, “5G NB”, and “cell” maybe used interchangeably herein.

In some aspects, a cell may not necessarily be stationary, and thegeographic area of the cell may move according to the location of amobile BS. In some aspects, the BSs may be interconnected to one anotherand/or to one or more other BSs or network nodes (not shown) in thewireless network 100 through various types of backhaul interfaces suchas a direct physical connection, a virtual network, and/or the likeusing any suitable transport network.

Wireless network 100 may also include relay stations. A relay station isan entity that can receive a transmission of data from an upstreamstation (e.g., a BS or a UE) and send a transmission of the data to adownstream station (e.g., a UE or a BS). A relay station may also be aUE that can relay transmissions for other UEs. In the example shown inFIG. 1 , a relay station 110 d may communicate with macro BS 110 a and aUE 120 d in order to facilitate communication between BS 110 a and UE120 d. A relay station may also be referred to as a relay BS, a relaybase station, a relay, and/or the like.

Wireless network 100 may be a heterogeneous network that includes BSs ofdifferent types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/orthe like. These different types of BSs may have different transmit powerlevels, different coverage areas, and different impacts on interferencein wireless network 100. For example, macro BSs may have a high transmitpower level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relayBSs may have lower transmit power levels (e.g., 0.1 to 2 Watts).

A network controller 130 may couple to a set of BSs and may providecoordination and control for these BSs. Network controller 130 maycommunicate with the BSs via a backhaul. The BSs may also communicatewith one another, e.g., directly or indirectly via a wireless orwireline backhaul.

UEs 120 (e.g., 120 a, 120 b, 120 c) may be dispersed throughout wirelessnetwork 100, and each UE may be stationary or mobile. A UE may also bereferred to as an access terminal, a terminal, a mobile station, asubscriber unit, a station, and/or the like. A UE may be a cellularphone (e.g., a smart phone), a personal digital assistant (PDA), awireless modem, a wireless communication device, a handheld device, alaptop computer, a cordless phone, a wireless local loop (WLL) station,a tablet, a camera, a gaming device, a netbook, a smartbook, anultrabook, a medical device or equipment, biometric sensors/devices,wearable devices (smart watches, smart clothing, smart glasses, smartwrist bands, smart jewelry (e.g., smart ring, smart bracelet)), anentertainment device (e.g., a music or video device, or a satelliteradio), a vehicular component or sensor, smart meters/sensors,industrial manufacturing equipment, a global positioning system device,or any other suitable device that is configured to communicate via awireless or wired medium.

Some UEs may be considered machine-type communication (MTC) or evolvedor enhanced machine-type communication (eMTC) UEs. MTC and eMTC UEsinclude, for example, robots, drones, remote devices, sensors, meters,monitors, location tags, and/or the like, that may communicate with abase station, another device (e.g., remote device), or some otherentity. A wireless node may provide, for example, connectivity for or toa network (e.g., a wide area network such as Internet or a cellularnetwork) via a wired or wireless communication link. Some UEs may beconsidered Internet-of-Things (IoT) devices, and/or may be implementedas NB-IoT (narrowband internet of things) devices. Some UEs may beconsidered a Customer Premises Equipment (CPE). UE 120 may be includedinside a housing that houses components of UE 120, such as processorcomponents, memory components, and/or the like.

In general, any number of wireless networks may be deployed in a givengeographic area. Each wireless network may support a particular radioaccess technology (RAT) and may operate on one or more frequencies. ARAT may also be referred to as a radio technology, an air interface,and/or the like. A frequency may also be referred to as a carrier, afrequency channel, and/or the like. Each frequency may support a singleRAT in a given geographic area in order to avoid interference betweenwireless networks of different RATs. In some cases, NR or 5G RATnetworks may be deployed.

In some aspects, two or more UEs 120 (e.g., shown as UE 120 a and UE 120e) may communicate directly using one or more sidelink channels (e.g.,without using a base station 110 as an intermediary to communicate withone another). For example, the UEs 120 may communicate usingpeer-to-peer (P2P) communications, device-to-device (D2D)communications, a vehicle-to-everything (V2X) protocol (e.g., which mayinclude a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure(V2I) protocol, and/or the like), a mesh network, and/or the like. Inthis case, the UE 120 may perform scheduling operations, resourceselection operations, and/or other operations described elsewhere hereinas being performed by the base station 110.

As indicated above, FIG. 1 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 1 .

FIG. 2 shows a block diagram of a design 200 of base station 110 and UE120, which may be one of the base stations and one of the UEs in FIG. 1. Base station 110 may be equipped with T antennas 234 a through 234 t,and UE 120 may be equipped with R antennas 252 a through 252 r, where ingeneral T≥1 and R≥1.

At base station 110, a transmit processor 220 may receive data from adata source 212 for one or more UEs, select one or more modulation andcoding schemes (MCS) for each UE based at least in part on channelquality indicators (CQIs) received from the UE, process (e.g., encodeand modulate) the data for each UE based at least in part on the MCS(s)selected for the UE, and provide data symbols for all UEs. Transmitprocessor 220 may also process system information (e.g., for semi-staticresource partitioning information (SRPI) and/or the like) and controlinformation (e.g., CQI requests, grants, upper layer signaling, and/orthe like) and provide overhead symbols and control symbols. Transmitprocessor 220 may also generate reference symbols for reference signals(e.g., the cell-specific reference signal (CRS)) and synchronizationsignals (e.g., the primary synchronization signal (PSS) and secondarysynchronization signal (SSS)). A transmit (TX) multiple-inputmultiple-output (MIMO) processor 230 may perform spatial processing(e.g., precoding) on the data symbols, the control symbols, the overheadsymbols, and/or the reference symbols, if applicable, and may provide Toutput symbol streams to T modulators (MODs) 232 a through 232 t. Eachmodulator 232 may process a respective output symbol stream (e.g., forOFDM and/or the like) to obtain an output sample stream. Each modulator232 may further process (e.g., convert to analog, amplify, filter, andupconvert) the output sample stream to obtain a downlink signal. Tdownlink signals from modulators 232 a through 232 t may be transmittedvia T antennas 234 a through 234 t, respectively. According to variousaspects described in more detail below, the synchronization signals canbe generated with location encoding to convey additional information.

At UE 120, antennas 252 a through 252 r may receive the downlink signalsfrom base station 110 and/or other base stations and may providereceived signals to demodulators (DEMODs) 254 a through 254 r,respectively. Each demodulator 254 may condition (e.g., filter, amplify,downconvert, and digitize) a received signal to obtain input samples.Each demodulator 254 may further process the input samples (e.g., forOFDM and/or the like) to obtain received symbols. A MIMO detector 256may obtain received symbols from all R demodulators 254 a through 254 r,perform MIMO detection on the received symbols if applicable, andprovide detected symbols. A receive processor 258 may process (e.g.,demodulate and decode) the detected symbols, provide decoded data for UE120 to a data sink 260, and provide decoded control information andsystem information to a controller/processor 280. A channel processormay determine reference signal received power (RSRP), received signalstrength indicator (RSSI), reference signal received quality (RSRQ),channel quality indicator (CQI), and/or the like. In some aspects, oneor more components of UE 120 may be included in a housing.

On the uplink, at UE 120, a transmit processor 264 may receive andprocess data from a data source 262 and control information (e.g., forreports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) fromcontroller/processor 280. Transmit processor 264 may also generatereference symbols for one or more reference signals. The symbols fromtransmit processor 264 may be precoded by a TX MIMO processor 266 ifapplicable, further processed by modulators 254 a through 254 r (e.g.,for DFT-s-OFDM, CP-OFDM, and/or the like), and transmitted to basestation 110. At base station 110, the uplink signals from UE 120 andother UEs may be received by antennas 234, processed by demodulators232, detected by a MIMO detector 236 if applicable, and furtherprocessed by a receive processor 238 to obtain decoded data and controlinformation sent by UE 120. Receive processor 238 may provide thedecoded data to a data sink 239 and the decoded control information tocontroller/processor 240. Base station 110 may include communicationunit 244 and communicate to network controller 130 via communicationunit 244. Network controller 130 may include communication unit 294,controller/processor 290, and memory 292.

Controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform one ormore techniques associated with clutter interference mitigation, asdescribed in more detail elsewhere herein. For example,controller/processor 240 of base station 110, controller/processor 280of UE 120, and/or any other component(s) of FIG. 2 may perform or directoperations of, for example, process 400 of FIG. 4 , process 500 of FIG.5 , and/or other processes as described herein. Memories 242 and 282 maystore data and program codes for base station 110 and UE 120,respectively. In some aspects, memory 242 and/or memory 282 may comprisea non-transitory computer-readable medium storing one or moreinstructions for wireless communication. For example, the one or moreinstructions, when executed by one or more processors of base station110 and/or UE 120, may perform or direct operations of, for example,process 400 of FIG. 4 , process 500 of FIG. 5 , and/or other processesas described herein. A scheduler 246 may schedule UEs for datatransmission on the downlink and/or uplink.

In some aspects, a wireless communication device (e.g., base station 110or UE 120) may include means for determining, for full-duplex modecommunication on a first link and a second link, a timing adjustment toat least one of a first timing or a second timing, wherein the timingadjustment is to cause a delay between reception of a clutter reflectionof a first signal and reception of a second signal to be within anadjusted cyclic prefix length of the second signal, wherein the adjustedcyclic prefix length is based at least in part on a scaling factor,means for causing the timing adjustment to be applied to the at leastone of the first timing or the second timing, means for communicating inthe full-duplex mode with a first node and a second node in accordancewith the timing adjustment based at least in part on causing the timingadjustment to be applied, wherein communicating includes transmittingthe first signal to the first node and receiving the second signal fromthe second node, and/or the like. In some aspects, base station 110 mayinclude means for determining, for full-duplex mode communication with afirst node and a second node, a first multiple access (MA) signature forthe first node and a second MA signature for the second node, whereinthe first MA signature and the second MA signature are selected tosuppress residual clutter interference, means for communicating in thefull-duplex mode with the first node using the first MA signature andwith the second node using the second MA signature, and/or the like. Insome aspects, such means may include one or more components of basestation 110 described in connection with FIG. 2 , such as antenna 234,DEMOD 232, MIMO detector 236, receive processor 238,controller/processor 240, transmit processor 220, TX MIMO processor 230,MOD 232, antenna 234, and/or the like. In some aspects, such means mayinclude one or more components of UE 120 described in connection withFIG. 2 , such as controller/processor 280, transmit processor 264, TXMIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256,receive processor 258, and/or the like

As indicated above, FIG. 2 is provided as an example. Other examples maydiffer from what is described with regard to FIG. 2 .

In some communications systems, a wireless communication device, such asa BS or a UE, may be configured to operate in a full-duplex mode. Forexample, a wireless communication device may concurrently transmit afirst signal to a first UE and receive a second signal from a second UE.Full-duplex mode communication enables the wireless communication deviceto achieve increased throughput and spectral efficiency relative tohalf-duplex operation. However, full-duplex mode communication may alsobe associated with higher levels of self-interference (e.g., which mayresult in a reduced signal to interference and noise ratio (SINR)).Self-interference may result from reflected transmission signalsinterfering with reception, and may be termed clutter interference orclutter echo.

The wireless communication device may transmit a first signal toward afirst node (e.g., a UE on an access link or a BS on a backhaul link),but the first signal may reflect off of a surrounding object, which maycause clutter echo when the first signal is reflected back toward thewireless communication device. In this case, the clutter echo may occurconcurrently with the wireless communication device attempting toreceive a signal from a second node (e.g., another UE or another BS),which may result in an interruption to communication with the secondwireless node. Some of the clutter interference may be mitigated bybeamforming to form nulls in a direction of an object causing theclutter echo. However, remaining residual clutter interference may stillcause SINR to be less than a threshold for successful receipt ofsignaling from the second node.

Some aspects described herein may enable clutter interferencemitigation. For example, a wireless communication device may adjust atiming alignment between a first signal that the wireless communicationdevice is to transmit and a second signal that the wirelesscommunication device is to receive, such that a delay between clutterecho from the first signal is within an adjusted cyclic prefix length(e.g., within a scaling factor of the cyclic prefix length) of thesecond signal. In this way, the wireless communication device may avoidinter-symbol interference and/or inter-carrier interference. Moreover,the wireless communication device may enable orthogonal demodulationreference signal (DMRS), or minimum mean square error interferencerejection combining (MMSE-IRC), based interference mitigation based atleast in part on causing the clutter echo to occur within the adjustedcyclic prefix length of the second signal.

In some aspects, the wireless communication device may use multipleaccess (MA) signatures to mitigate residual clutter inference. Forexample, alone or in combination with adjusting a timing alignment, thewireless communication device may cause the first signal and the secondsignal to have different MA signatures (e.g., different DMRSconfigurations), thereby enabling separable channel estimation for thefirst signal and the second signal. In this case, the wirelesscommunication device reduces clutter interference, thereby improvingSINR and reducing a likelihood of dropped communications.

FIGS. 3A-3D are diagrams illustrating an example 300 of clutterinterference mitigation, in accordance with various aspects of thepresent disclosure. As shown in FIG. 3A, example 300 includes a wirelesscommunication device 301 in communication with a set of nodes 302 (e.g.,a first UE 120-1 and a second UE 120-2, a first BS 110-1 and a second BS110-2, a combination thereof, and/or the like) in a full-duplex mode. Insome aspects, a reflecting object 305 may be disposed at least partiallyin a transmission path of wireless communication device 301. Forexample, reflecting object 305 may be another node, a geographicalfeature, a building, and/or the like.

As further shown in FIG. 3A, wireless communication device 301 mayinclude a transmitter (TX) associated with transmitting a firstcommunication 315-1 using a plurality of TX beams 310-1 and a receiver(RX) associated with receiving a communication 315-2 using a pluralityof RX beams 310-2. In this case, wireless communication device 301 mayoperate in a full-duplex mode, where wireless communication device 301transmits TX beams 310-1 within a threshold proximity of (e.g.,concurrently with) receiving RX beams 310-2. In some aspects, based atleast in part on using a plurality of TX beams 310-1 for communication315-1 (e.g., using beam sweeping), a beam 310-1 a may be directed towardfirst node 302-1 and a beam 310-1 b may reflect off reflecting object305, resulting in interfering transmission 320. In this case,interfering transmission 320 may be a clutter echo caused by reflectingobject 305.

FIG. 3B shows an example of a timing alignment of the beams 310. Forexample, second node 302-2 may transmit communication 315-2 at a firsttime t₁. A delay 325 associated with communication 315-2 propagatingtoward wireless communication device 301 may result in wirelesscommunication device 301 receiving communication 315-2 at a second timet₂. Similarly, wireless communication device 301 may transmitcommunication 315-1 toward first node 302-1 at the second time t₂. Inthis case, a delay 330 associated with beam 310-1 b propagating towardreflecting object 305 and reflecting back, as interfering transmission320, toward wireless communication device 301 may result in wirelesscommunication device 301 receiving interfering transmission 320 at athird time t₃. In this case, wireless communication device 301 may startreceiving interfering transmission 320 during a payload portion ofcommunication 315-2, which may result in clutter interference and anSINR of less than a threshold for successful communication.

As shown in FIG. 3C, and by reference number 335, based at least in parton detecting clutter interference from receiving interferingtransmission 320, wireless communication device 301 may determine atiming adjustment. For example, wireless communication device 301 maydetermine to adjust a timing of at least one of communication 315-1 orcommunication 315-2 to cause the delay between transmittingcommunication 315-1 and receiving interfering transmission 320 to occurwithin an adjusted cyclic prefix (CP) length of communication 315-2. Insome aspects, the adjusted cyclic prefix length may be based at least inpart on the cyclic prefix length multiplied by a scaling factor. In someaspects, the scaling factor is less than or equal to 1. Additionally, oralternatively, the scaling factor may be based at least in part on amodulation and coding scheme of, for example, communication 315-2. Inthis way, wireless communication device 301 avoids inter-symbolinterference and/or inter-carrier interference and allows for orthogonalDMRS-based interference suppression or MMSE-IRC-based interferencesuppression.

In some aspects, wireless communication device 301 may determine toadjust the timing based at least in part on a particular type of channelmeasurement. For example, wireless communication device 301 may receivean indication of a measurement of a reference signal or synchronizationsignal block transmitted to first node 302-1. Additionally, oralternatively, wireless communication device 301 may perform a clutterinterference measurement of the reference signal or synchronizationsignal block transmission at a time when second node 302-2 is nottransmitting, to identify the clutter interference caused by interferingobject 305. In some aspects, wireless communication device 301 maydetermine the timing adjustment based at least in part on a measurementof a reference signal or synchronization signal block transmissionreceived from second node 302-2, to determine a level of SINR to achieveto successfully receive the reference signal or synchronization signalblock.

In some aspects, wireless communication device 301 may determine toadjust the timing based at least in part on a capability of nodes 302.For example, wireless communication device 301 may determine whethernodes 302 are capable of full-duplex multiplexing (e.g., based at leastin part on an SINR measurement, a clutter interference leakage, and/orthe like), and may determine to adjust the timing based at least in parton determining that nodes 302 are capable of full-duplex mode operation.

In some aspects, wireless communication device 301 may determine atiming adjustment (TA) command and provide the TA command, as shown byreference number 340, to at least one of first node 302-1 or second node302-2 to adjust a timing of at least one of communication 315-1 orcommunication 315-2. For example, when wireless communication device 301is a gNB-type of BS connected to first node 302-1 on a downlink andsecond node 302-2 on an uplink, wireless communication device 301 mayprovide a TA command to second node 302-2 to cause a change to a timingof communication 315-2. In another example, when wireless communicationdevice 301 is an IAB-node-type of BS receiving from a parent node (e.g.,second node 302-2) and transmitting to a child node (e.g., first node302-1), wireless communication device 301 may self-adjust a transmittime of communication 315-1. In this case, wireless communication device301 may indicate to first node 302-1 that the transmit time ofcommunication 315-1 is adjusted. In some aspects, wireless communicationdevice 301 may adjust a transmit time of both communication 315-1 andcommunication 315-2.

In some aspects, wireless communication device 301 may reportinformation relating to the timing adjustment to enable another deviceto determine whether to continue with full-duplex mode operation and/orto determine the timing adjustment. For example, wireless communicationdevice 301 may report time delays 325 and/or 330 to a parent node (e.g.,second node 302-2), and the parent node may provide an indication of thetiming adjustment or an indication to cease using full-duplex modeoperation. Additionally, or alternatively, wireless communication device301 may report a clutter interference measurement to the parent node,and the parent node may provide the indication of the timing adjustment,or the indication to cease, using the full-duplex mode operation.

In some aspects, wireless communication device 301 may adjust anothercharacteristic of communications 315-1 and/or 315-2 to mitigate clutterinterference. For example, wireless communication device 301 may usedifferent MA signatures for communications 315-1 and 315-2 to enableseparable channel estimation. In this case, wireless communicationdevice 301 may use a first DMRS for communication 315-1 and (may causesecond node 302-2 to use) a second DMRS for communication 315-2. Forexample, the first DMRS and the second DMRS may be configured with thesame time and frequency resources and base sequence, but differentcyclic shifts. Alternatively, the first DMRS and the second DMRS may beconfigured with the same time and frequency resources, but differentbase sequences. Alternatively, the first DMRS and the second DMRS may beconfigured with different time and frequency resources. In this case,time and frequency resources of the first DMRS may be avoided for thesecond DMRS and time and frequency resources of the second DMRS may beavoided for the first DMRS, thereby enabling separable channelestimation.

In some aspects, wireless communication device 301 may use resourcespread multiple access (RSMA) signatures for the communications 315 toenable mitigation of clutter interference. For example, wirelesscommunication device 301 may configure an RSMA repetition factor tocause a particular MA signature length based at least in part on aclutter interference level measurement, a threshold SINR that is to beachieved, a threshold throughput that is to be achieved, and/or thelike. In this case, wireless communication device 301 may determine anMA signature length, and may provide information identifying the MAsignature length to nodes 302-1 and/or 302-2. Additionally, oralternatively, wireless communication device 301 may request that nodes302-1 and/or 302-2 use the MA signature length and may receiveconfirmation indicating that nodes 302-1 and/or 302-2 are to use the MAsignature length. Alternatively, wireless communication device 301 mayprovide a clutter interference measurement report to node 302-1 or 302-2and may receive a response identifying an MA signature length from node302-1 or 302-2 (e.g., when node 302-1 or 302-2 is a parent node ofwireless communication device 301).

FIG. 3D shows an example of a timing alignment of the beams 310 afterapplying a timing adjustment (and, in some aspects, using MAsignatures). In this case, second node 302-2 may transmit communication315-2 at the first time t₁. Based at least in part on adjusting a timingof transmission of TX beams 310-1 by a shift 345, wireless communicationdevice 301 transmits TX beams 310-1 at a time t_(A), that is between thefirst time t₁ and the second time t₂ (e.g., t_(A) is during delay 325).As a result, as shown, delay 330 (e.g., from transmission ofcommunication 315-1 at time t_(A) to an occurrence interferingtransmission at time t_(B)) occurs during the adjusted cyclic prefixlength portion of receiving communication 315-2. As a result, wirelesscommunication device 301 may avoid inter-symbol interference and/orinter-carrier interference, and enables DMRS-based interferencesuppression and/or MMSE-IRC-based interference suppression.

As indicated above, FIGS. 3A-3D are provided as an example. Otherexamples may differ from what is described with respect to FIGS. 3A-3D.

FIG. 4 is a diagram illustrating an example process 400 performed, forexample, by a BS, in accordance with various aspects of the presentdisclosure. Example process 400 is an example where the wirelesscommunication device (e.g., BS 110, UE 120, wireless communicationdevice 301 and/or the like) performs operations associated with clutterinterference mitigation.

As shown in FIG. 4 , in some aspects, process 400 may includedetermining, for full-duplex mode communication on a first link and asecond link, a timing adjustment to at least one of a first timing or asecond timing, wherein the timing adjustment is to cause a delay betweenreception of a clutter reflection of a first signal and reception of asecond signal to be within an adjusted cyclic prefix length of thesecond signal, wherein the adjusted cyclic prefix length is based atleast in part on a scaling factor (block 410). For example, the wirelesscommunication device (e.g., controller/processor 240,controller/processor 280, and/or the like) determining, for full-duplexmode communication on a first link and a second link, a timingadjustment to at least one of a first timing or a second timing, asdescribed above. In some aspects, the timing adjustment is to cause adelay between reception of a clutter reflection of a first signal andreception of a second signal to be within an adjusted cyclic prefixlength of the second signal. In some aspects, the adjusted cyclic prefixlength is based at least in part on a scaling factor.

As further shown in FIG. 4 , in some aspects, process 400 may includecausing the timing adjustment to be applied to the at least one of thefirst timing or the second timing (block 420). For example, the wirelesscommunication device (e.g., controller/processor 240, transmit processor220, TX MIMO processor 230, MOD 232, antenna 234, controller/processor280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna252, and/or the like) may cause the timing adjustment to be applied tothe at least one of the first timing or the second timing, as describedabove.

As further shown in FIG. 4 , in some aspects, process 400 may includecommunicating in the full-duplex mode with a first node and a secondnode in accordance with the timing adjustment based at least in part oncausing the timing adjustment to be applied, wherein communicatingincludes transmitting the first signal to the first node and receivingthe second signal from the second node (block 430). For example, thewireless communication device (e.g., antenna 234, DEMOD 232, MIMOdetector 236, receive processor 238, controller/processor 240, transmitprocessor 220, TX MIMO processor 230, MOD 232, antenna 252, DEMOD 254,MIMO detector 256, receive processor 258, controller/processor 280,transmit processor 264, TX MIMO processor 266, MOD 254, and/or the like)may communicate in the full-duplex mode with a first node and a secondnode in accordance with the timing adjustment based at least in part oncausing the timing adjustment to be applied, as described above. In someaspects, communicating includes transmitting the first signal to thefirst node and receiving the second signal from the second node.

Process 400 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, causing the timing adjustment to be applied includesadjusting the first timing of the first signal.

In a second aspect, alone or in combination with the first aspect,causing the timing adjustment to be applied includes providing, to thesecond node, a timing advance command identifying the timing adjustmentto cause a change to the second timing of the second signal.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the delay is entirely within the adjusted cyclicprefix length of the second signal.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the delay is at least partially within theadjusted cyclic prefix length of the second signal.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, determining the timing adjustment includesdetermining the timing adjustment based at least in part on a clutterinterference measurement of a reference signal or a synchronizationsignal block transmission to the first node.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, determining the timing adjustment includesdetermining the timing adjustment based at least in part on a channelmeasurement of a reference signal or a synchronization signal from thesecond node.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, communicating in the full-duplex modeincludes communicating in the full-duplex mode based at least in part ona signal to interference noise requirement of at least one of the firstlink or the second link and based at least in part on a clutterinterference leakage determination for the second signal.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, process 400 includes reporting a timedelay for the first node and the second node to a parent node of thewireless communication device and receiving an indication of whether tocommunicate in the full-duplex mode based at least in part on reportingthe time delay, and communicating in the full-duplex mode includescommunicating in the full-duplex mode based at least in part onreceiving the indication of whether to communicate in the full-duplexmode.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, process 400 includes determining a firstmultiple access (MA) signature for the first node and a second MAsignature for the second node, wherein the first MA signature and thesecond MA signature are selected to suppress residual clutterinterference, and communicating in the full-duplex mode includescommunicating in the full-duplex mode with the first node using thefirst MA signature and with the second node using the second MAsignature.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, the scaling factor is less than or equal to one.

In an eleventh aspect, alone or in combination with one or more of thefirst through tenth aspects, the scaling factor is based at least inpart on at least one of: a modulation of the second signal or a coderate of the second signal.

Although FIG. 4 shows example blocks of process 400, in some aspects,process 400 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 4 .Additionally, or alternatively, two or more of the blocks of process 400may be performed in parallel.

FIG. 5 is a diagram illustrating an example process 500 performed, forexample, by a wireless communication device, in accordance with variousaspects of the present disclosure. Example process 500 is an examplewhere the wireless communication device (e.g., BS 110, UE 120, wirelesscommunication device 301, and/or the like) performs operationsassociated with clutter interference mitigation.

As shown in FIG. 5 , in some aspects, process 500 may includedetermining, for full-duplex mode communication with a first node and asecond node, a first multiple access (MA) signature for the first nodeand a second MA signature for the second node, wherein the first MAsignature and the second MA signature are selected to suppress residualclutter interference (block 510). For example, the wirelesscommunication device (e.g., controller/processor 240,controller/processor 280, and/or the like) may determine, forfull-duplex mode communication with a first node and a second node, afirst MA signature for the first node and a second MA signature for thesecond node, as described above. In some aspects, the first MA signatureand the second MA signature are selected to suppress residual clutterinterference.

As further shown in FIG. 5 , in some aspects, process 500 may includecommunicating in the full-duplex mode with the first node using thefirst MA signature and with the second node using the second MAsignature (block 520). For example, the wireless communication device(e.g., antenna 234, DEMOD 232, MIMO detector 236, receive processor 238,controller/processor 240, transmit processor 220, TX MIMO processor 230,MOD 232, antenna 252, DEMOD 254, MIMO detector 256, receive processor258, controller/processor 280, transmit processor 264, TX MIMO processor266, MOD 254, and/or the like) may communicate in the full-duplex modewith the first node using the first MA signature and with the secondnode using the second MA signature, as described above.

Process 500 may include additional aspects, such as any single aspect orany combination of aspects described below and/or in connection with oneor more other processes described elsewhere herein.

In a first aspect, a first demodulation reference signal (DMRS)configuration of a first signal transmitted to the first node and asecond DMRS configuration of a second signal received from the secondnode are selected to enable separate channel estimation for the firstsignal and the second signal.

In a second aspect, alone or in combination with the first aspect, thefirst DMRS and the second DMRS use the same time resources, the samefrequency resources, and the same base sequence.

In a third aspect, alone or in combination with one or more of the firstand second aspects, the first DMRS and the second DMRS use the same timeresources and the same frequency resources.

In a fourth aspect, alone or in combination with one or more of thefirst through third aspects, the first DMRS uses a first time resourceand the second DMRS uses a second time resource.

In a fifth aspect, alone or in combination with one or more of the firstthrough fourth aspects, the first DMRS uses a first frequency resourceand the second DMRS uses a second frequency resource.

In a sixth aspect, alone or in combination with one or more of the firstthrough fifth aspects, the first MA signature and the second MAsignature are resource spread multiple access signatures.

In a seventh aspect, alone or in combination with one or more of thefirst through sixth aspects, lengths of the first MA signature and thesecond MA signature are selected based at least in part on at least oneof a clutter interference level, a configured maximum signal tointerference noise ratio, or a configured maximum throughput on a linkto the second node.

In an eighth aspect, alone or in combination with one or more of thefirst through seventh aspects, process 500 includes transmittinginformation identifying a length of the first MA signature to the firstnode, and transmitting information identifying a length of the second MAsignature to the second node.

In a ninth aspect, alone or in combination with one or more of the firstthrough eighth aspects, process 500 includes transmitting informationidentifying a clutter interference measurement; and receiving, as aresponse to the information identifying the clutter interferencemeasurement, information identifying at least one of a length of thefirst MA signature or a length of the second MA signature.

In a tenth aspect, alone or in combination with one or more of the firstthrough ninth aspects, process 500 includes determining a timingadjustment to at least one of a first timing or a second timing, whereinthe timing adjustment is to cause a delay between reception of a clutterreflection of a first signal and reception of a second signal to bewithin an adjusted cyclic prefix length of the second signal, whereinthe adjusted cyclic prefix length is based at least in part on a scalingfactor; causing the timing adjustment to be applied to the at least oneof the first timing or the second timing; and communicating in thefull-duplex mode with the first node and the second node in accordancewith the timing adjustment based at least in part on causing the timingadjustment to be applied, wherein communicating includes transmittingthe first signal to the first node and receiving the second signal fromthe second node.

Although FIG. 5 shows example blocks of process 500, in some aspects,process 500 may include additional blocks, fewer blocks, differentblocks, or differently arranged blocks than those depicted in FIG. 5 .Additionally, or alternatively, two or more of the blocks of process 500may be performed in parallel.

The following provides an overview of some aspects of the presentdisclosure:

Aspect 1: A method of wireless communication performed by a wirelesscommunication device, comprising: determining, for full-duplex modecommunication on a first link and a second link, a timing adjustment toat least one of a first timing or a second timing, wherein the timingadjustment is to cause a delay between reception of a clutter reflectionof a first signal and reception of a second signal to be within anadjusted cyclic prefix length of the second signal, wherein the adjustedcyclic prefix length is based at least in part on a scaling factor;causing the timing adjustment to be applied to the at least one of thefirst timing or the second timing; and communicating in the full-duplexmode with a first node and a second node in accordance with the timingadjustment based at least in part on causing the timing adjustment to beapplied, wherein communicating includes transmitting the first signal tothe first node and receiving the second signal from the second node.

Aspect 2: The method of aspect 1, wherein the scaling factor is lessthan or equal to one.

Aspect 3: The method of any of aspects 1 to 2, wherein the scalingfactor is based at least in part on at least one of: a modulation of thesecond signal or a code rate of the second signal.

Aspect 4: The method of any of aspects 1 to 3, wherein causing thetiming adjustment to be applied comprises: adjusting the first timing ofthe first signal.

Aspect 5: The method of any of aspects 1 to 4, wherein causing thetiming adjustment to be applied comprises: providing, to the secondnode, a timing advance command identifying the timing adjustment tocause a change to the second timing of the second signal.

Aspect 6: The method of any of aspects 1 to 5, wherein the delay isentirely within the adjusted cyclic prefix length of the second signal.

Aspect 7: The method of any of aspects 1 to 6, wherein the delay is atleast partially within the adjusted cyclic prefix length of the secondsignal.

Aspect 8: The method of any of aspects 1 to 7, wherein determining thetiming adjustment comprises: determining the timing adjustment based atleast in part on a clutter interference measurement of a referencesignal or a synchronization signal block transmission to the first node.

Aspect 9: The method of any of aspects 1 to 8, wherein determining thetiming adjustment comprises: determining the timing adjustment based atleast in part on a channel measurement of a reference signal or asynchronization signal from the second node.

Aspect 10: The method of any of aspects 1 to 9, wherein communicating inthe full-duplex mode comprises: communicating in the full-duplex modebased at least in part on a signal to interference noise requirement ofat least one of the first link or the second link and based at least inpart on a clutter interference leakage determination for the secondsignal.

Aspect 11: The method of any of aspects 1 to 10, further comprising:reporting a time delay for the first node and the second node to aparent node of the wireless communication device; and receiving anindication of whether to communicate in the full-duplex mode based atleast in part on reporting the time delay; and wherein communicating inthe full-duplex mode comprises: communicating in the full-duplex modebased at least in part on receiving the indication of whether tocommunicate in the full-duplex mode.

Aspect 12: The method of any of aspects 1 to 11, further comprising:determining a first multiple access (MA) signature for the first nodeand a second MA signature for the second node, wherein the first MAsignature and the second MA signature are selected to suppress residualclutter interference; and wherein communicating in the full-duplex modecomprises: communicating in the full-duplex mode with the first nodeusing the first MA signature and with the second node using the secondMA signature.

Aspect 13: A method of wireless communication performed by a wirelesscommunication device, comprising: determining, for full-duplex modecommunication with a first node and a second node, a first multipleaccess (MA) signature for the first node and a second MA signature forthe second node, wherein the first MA signature and the second MAsignature are selected to suppress residual clutter interference; andcommunicating in the full-duplex mode with the first node using thefirst MA signature and with the second node using the second MAsignature.

Aspect 14: The method of aspect 13, wherein a first demodulationreference signal (DMRS) configuration of a first signal transmitted tothe first node and a second DMRS configuration of a second signalreceived from the second node are selected to enable separate channelestimation for the first signal and the second signal.

Aspect 15: The method of aspect 14, wherein the first DMRS and thesecond DMRS use the same time resources, the same frequency resources,and the same base sequence, and wherein the first DMRS uses a firstcyclic shift and the second DMRS uses a second cyclic shift.

Aspect 16: The method of any of aspects 14 to 15, wherein the first DMRSand the second DMRS use the same time resources and the same frequencyresources, and wherein the first DMRS uses a first base sequence and thesecond DMRS uses a second base sequence.

Aspect 17: The method of any of aspects 14 to 16, wherein the first DMRSuses a first time resource and the second DMRS uses a second timeresource.

Aspect 18: The method of any of aspects 14 to 17, wherein the first DMRSuses a first frequency resource and the second DMRS uses a secondfrequency resource.

Aspect 19: The method of any of aspects 13 to 18, wherein the first MAsignature and the second MA signature are resource spread multipleaccess signatures.

Aspect 20: The method of any of aspects 13 to 19, wherein lengths of thefirst MA signature and the second MA signature are selected based atleast in part on at least one of: a clutter interference level, aconfigured maximum signal to interference noise ratio, or a configuredmaximum throughput on a link to the second node.

Aspect 21: The method of any of aspects 13 to 20, further comprising:transmitting information identifying a length of the first MA signatureto the first node; and transmitting information identifying a length ofthe second MA signature to the second node.

Aspect 22: The method of any of aspects 13 to 21, further comprising:transmitting information identifying a clutter interference measurement;and receiving, as a response to the information identifying the clutterinterference measurement, information identifying at least one of alength of the first MA signature or a length of the second MA signature.

Aspect 23: The method of any of aspects 13 to 22, further comprising:determining a timing adjustment to at least one of a first timing or asecond timing, wherein the timing adjustment is to cause a delay betweenreception of a clutter reflection of a first signal and reception of asecond signal to be within an adjusted cyclic prefix length of thesecond signal, wherein the adjusted cyclic prefix length is based atleast in part on a scaling factor; causing the timing adjustment to beapplied to the at least one of the first timing or the second timing;and communicating in the full-duplex mode with the first node and thesecond node in accordance with the timing adjustment based at least inpart on causing the timing adjustment to be applied, whereincommunicating includes transmitting the first signal to the first nodeand receiving the second signal from the second node.

Aspect 24: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more aspects ofaspects 1-12.

Aspect 25: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the memory and the one ormore processors configured to perform the method of one or more aspectsof aspects 1-12.

Aspect 26: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more aspects of aspects1-12.

Aspect 27: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more aspects of aspects 1-12.

Aspect 28: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore aspects of aspects 1-12.

Aspect 29: An apparatus for wireless communication at a device,comprising a processor; memory coupled with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to perform the method of one or more aspects ofaspects 13-23.

Aspect 30: A device for wireless communication, comprising a memory andone or more processors coupled to the memory, the memory and the one ormore processors configured to perform the method of one or more aspectsof aspects 13-23.

Aspect 31: An apparatus for wireless communication, comprising at leastone means for performing the method of one or more aspects of aspects13-23.

Aspect 32: A non-transitory computer-readable medium storing code forwireless communication, the code comprising instructions executable by aprocessor to perform the method of one or more aspects of aspects 13-23.

Aspect 33: A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a device, cause the device to perform the method of one ormore aspects of aspects 13-23.

The foregoing disclosure provides illustration and description, but isnot intended to be exhaustive or to limit the aspects to the preciseform disclosed. Modifications and variations may be made in light of theabove disclosure or may be acquired from practice of the aspects.

As used herein, the term “component” is intended to be broadly construedas hardware, firmware, and/or a combination of hardware and software. Asused herein, a processor is implemented in hardware, firmware, and/or acombination of hardware and software.

As used herein, satisfying a threshold may, depending on the context,refer to a value being greater than the threshold, greater than or equalto the threshold, less than the threshold, less than or equal to thethreshold, equal to the threshold, not equal to the threshold, and/orthe like.

It will be apparent that systems and/or methods described herein may beimplemented in different forms of hardware, firmware, and/or acombination of hardware and software. The actual specialized controlhardware or software code used to implement these systems and/or methodsis not limiting of the aspects. Thus, the operation and behavior of thesystems and/or methods were described herein without reference tospecific software code—it being understood that software and hardwarecan be designed to implement the systems and/or methods based, at leastin part, on the description herein.

Even though particular combinations of features are recited in theclaims and/or disclosed in the specification, these combinations are notintended to limit the disclosure of various aspects. In fact, many ofthese features may be combined in ways not specifically recited in theclaims and/or disclosed in the specification. Although each dependentclaim listed below may directly depend on only one claim, the disclosureof various aspects includes each dependent claim in combination withevery other claim in the claim set. A phrase referring to “at least oneof” a list of items refers to any combination of those items, includingsingle members. As an example, “at least one of: a, b, or c” is intendedto cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combinationwith multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c,a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering ofa, b, and c).

No element, act, or instruction used herein should be construed ascritical or essential unless explicitly described as such. Also, as usedherein, the articles “a” and “an” are intended to include one or moreitems, and may be used interchangeably with “one or more.” Furthermore,as used herein, the terms “set” and “group” are intended to include oneor more items (e.g., related items, unrelated items, a combination ofrelated and unrelated items, and/or the like), and may be usedinterchangeably with “one or more.” Where only one item is intended, thephrase “only one” or similar language is used. Also, as used herein, theterms “has,” “have,” “having,” and/or the like are intended to beopen-ended terms. Further, the phrase “based on” is intended to mean“based, at least in part, on” unless explicitly stated otherwise.

What is claimed is:
 1. A wireless communication device for wirelesscommunication, comprising: a memory; and one or more processors coupledto the memory, the one or more processors configured to cause thewireless communication device to: determine, for full-duplex modecommunication with a first node and a second node, a first multipleaccess (MA) signature for the first node and a second MA signature forthe second node, wherein the first MA signature and the second MAsignature are selected to suppress residual clutter interference; andcommunicate in a full-duplex mode with the first node using the first MAsignature and with the second node using the second MA signature,wherein the one or more processors are further configured to cause thewireless communication device to: determine a timing adjustment to atleast one of a first timing or a second timing, wherein the timingadjustment is to cause a delay between reception of a clutter reflectionof a first signal and reception of a second signal to be within anadjusted cyclic prefix length of the second signal, wherein the adjustedcyclic prefix length is based at least in part on a scaling factor;cause the timing adjustment to be applied to the at least one of thefirst timing or the second timing; and communicate in the full-duplexmode with the first node and the second node in accordance with thetiming adjustment based at least in part on causing the timingadjustment to be applied, wherein communicating includes transmittingthe first signal to the first node and receiving the second signal fromthe second node.
 2. The wireless communication device of claim 1,wherein a first demodulation reference signal (DMRS) configuration ofthe first signal transmitted to the first node and a second DMRSconfiguration of the second signal received from the second node areselected to enable separate channel estimation for the first signal andthe second signal.
 3. The wireless communication device of claim 2,wherein the first DMRS and the second DMRS use same time resources, samefrequency resources, and a same base sequence, and wherein the firstDMRS uses a first cyclic shift and the second DMRS uses a second cyclicshift.
 4. The wireless communication device of claim 2, wherein thefirst DMRS and the second DMRS use same time resources and samefrequency resources, and wherein the first DMRS uses a first basesequence and the second DMRS uses a second base sequence.
 5. Thewireless communication device of claim 2, wherein the first DMRS uses afirst time resource and the second DMRS uses a second time resource. 6.The wireless communication device of claim 2, wherein the first DMRSuses a first frequency resource and the second DMRS uses a secondfrequency resource.
 7. The wireless communication device of claim 1,wherein the first MA signature and the second MA signature are resourcespread multiple access signatures.
 8. The wireless communication deviceof claim 1, wherein lengths of the first MA signature and the second MAsignature are selected based at least in part on at least one of: aclutter interference level, a configured maximum signal to interferencenoise ratio, or a configured maximum throughput on a link to the secondnode.
 9. The wireless communication device of claim 1, wherein the oneor more processors are further configured to cause the wirelesscommunication device to: transmit information identifying a length ofthe first MA signature to the first node; and transmit informationidentifying a length of the second MA signature to the second node. 10.The wireless communication device of claim 1, wherein the one or moreprocessors are further configured to cause the wireless communicationdevice to: transmit information identifying a clutter interferencemeasurement; and receive, as a response to the information identifyingthe clutter interference measurement, information identifying at leastone of a length of the first MA signature or a length of the second MAsignature.
 11. A method of wireless communication performed by awireless communication device, comprising: determining, for full-duplexmode communication with a first node and a second node, a first multipleaccess (MA) signature for the first node and a second MA signature forthe second node, wherein the first MA signature and the second MAsignature are selected to suppress residual clutter interference; andcommunicating in a full-duplex mode with the first node using the firstMA signature and with the second node using the second MA signature,wherein the method further comprises: determining a timing adjustment toat least one of a first timing or a second timing, wherein the timingadjustment is to cause a delay between reception of a clutter reflectionof a first signal and reception of a second signal to be within anadjusted cyclic prefix length of the second signal, wherein the adjustedcyclic prefix length is based at least in part on a scaling factor;causing the timing adjustment to be applied to the at least one of thefirst timing or the second timing; and communicating in the full-duplexmode with the first node and the second node in accordance with thetiming adjustment based at least in part on causing the timingadjustment to be applied, wherein communicating includes transmittingthe first signal to the first node and receiving the second signal fromthe second node.
 12. The method of claim 11, wherein a firstdemodulation reference signal (DMRS) configuration of the first signaltransmitted to the first node and a second DMRS configuration of thesecond signal received from the second node are selected to enableseparate channel estimation for the first signal and the second signal.13. The method of claim 12, wherein the first DMRS and the second DMRSuse same time resources, same frequency resources, and a same basesequence, and wherein the first DMRS uses a first cyclic shift and thesecond DMRS uses a second cyclic shift.
 14. The method of claim 12wherein the first DMRS and the second DMRS use same time resources andsame frequency resources, and wherein the first DMRS uses a first basesequence and the second DMRS uses a second base sequence.
 15. The methodof claim 12, wherein the first DMRS uses a first time resource and thesecond DMRS uses a second time resource.
 16. The method of claim 12,wherein the first DMRS uses a first frequency resource and the secondDMRS uses a second frequency resource.
 17. The method of claim 11,wherein the first MA signature and the second MA signature are resourcespread multiple access signatures.
 18. The method of claim 11, whereinlengths of the first MA signature and the second MA signature areselected based at least in part on at least one of: a clutterinterference level, a configured maximum signal to interference noiseratio, or a configured maximum throughput on a link to the second node.19. The method of claim 11, further comprising: transmitting informationidentifying a length of the first MA signature to the first node; andtransmitting information identifying a length of the second MA signatureto the second node.
 20. The method of claim 11, further comprising:transmitting information identifying a clutter interference measurement;and receiving, as a response to the information identifying the clutterinterference measurement, information identifying at least one of alength of the first MA signature or a length of the second MA signature.21. A non-transitory computer-readable medium storing a set ofinstructions for wireless communication, the set of instructionscomprising one or more instructions that, when executed by one or moreprocessors of a wireless communication device, cause the wirelesscommunication device to: determine, for full-duplex mode communicationwith a first node and a second node, a first multiple access (MA)signature for the first node and a second MA signature for the secondnode, wherein the first MA signature and the second MA signature areselected to suppress residual clutter interference; and communicate in afull-duplex mode with the first node using the first MA signature andwith the second node using the second MA signature, wherein the one ormore instructions further cause the wireless communication device to:determine a timing adjustment to at least one of a first timing or asecond timing, wherein the timing adjustment is to cause a delay betweenreception of a clutter reflection of a first signal and reception of asecond signal to be within an adjusted cyclic prefix length of thesecond signal, wherein the adjusted cyclic prefix length is based atleast in part on a scaling factor; cause the timing adjustment to beapplied to the at least one of the first timing or the second timing;and communicate in a full-duplex mode with the first node and the secondnode in accordance with the timing adjustment based at least in part oncausing the timing adjustment to be applied, wherein communicatingincludes transmitting the first signal to the first node and receivingthe second signal from the second node.
 22. The non-transitorycomputer-readable medium of claim 21, wherein a first demodulationreference signal (DMRS) configuration of the first signal transmitted tothe first node and a second DMRS configuration of the second signalreceived from the second node are selected to enable separate channelestimation for the first signal and the second signal.
 23. Thenon-transitory computer-readable medium of claim 21, wherein the firstMA signature and the second MA signature are resource spread multipleaccess signatures.
 24. The non-transitory computer-readable medium ofclaim 21, wherein lengths of the first MA signature and the second MAsignature are selected based at least in part on at least one of: aclutter interference level, a configured maximum signal to interferencenoise ratio, or a configured maximum throughput on a link to the secondnode.
 25. The non-transitory computer-readable medium of claim 21,wherein the one or more instructions further cause the wirelesscommunication device to: transmit information identifying a length ofthe first MA signature to the first node; and transmit informationidentifying a length of the second MA signature to the second node. 26.The non-transitory computer-readable medium of claim 21, wherein the oneor more instructions further cause the wireless communication device to:transmit information identifying a clutter interference measurement; andreceive, as a response to the information identifying the clutterinterference measurement, information identifying at least one of alength of the first MA signature or a length of the second MA signature.27. The non-transitory computer-readable medium of claim 22, wherein:the first DMRS and the second DMRS use same time resources, samefrequency resources, and a same base sequence; and the first DMRS uses afirst cyclic shift and the second DMRS uses a second cyclic shift. 28.The non-transitory computer-readable medium of claim 22, wherein thefirst DMRS and the second DMRS use same time resources and samefrequency resources, and the first DMRS uses a first base sequence andthe second DMRS uses a second base sequence.
 29. The non-transitorycomputer-readable medium of claim 22, wherein the first DMRS uses afirst time resource and the second DMRS uses a second time resource. 30.The non-transitory computer-readable medium of claim 22, wherein thefirst DMRS uses a first frequency resource and the second DMRS uses asecond frequency resource.